Method of making cylinder gears



Jul 12, 1938. w. M. WATTlE 2,123,265

Q I METHOD OF MAKING CYLINDER GEARS Filed April 10, 1955 Patented July 12, 1938 PATENT OFFICE METHOD or MAKING CYLINDER GEARS William M. Wattie, Worcester, Mass., assignor to Crompton & Knowles Loom Works, Worcester, Mass, a corporation of Massachusetts Application April 10, 1935, Serial No. 15,602

ZCIaims. (Cl. 29-4592) 7 This invention relates to cylinder gears asused .im the 'type -of harness motion known as a fKnowles head. These cylinder gears intermittently actuate the vibrator gears and'are pro- .vided with teeth aroundslightly less than onehalf of their periphery, the remaining portion 'being cylindrical and of not greater diameter than the roots of the gear teeth.

It has been customary to cast the cylinder gear blanks in a single piece and to thereafter submit the blanks to an extended series of machine operations which consumed much time and labor.

It is one object of my present invention to provide a built-up cylinder gear of an improved and reliable construction. A further object is to provide an improved method of producing my improved cylinder gear.

My invention further relates to certain arrangements and combinations of parts and to certain steps and sequences in procedure which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of the invention is shown in the drawing, in which a" Fig. 1 is a front elevation of one of the cylinder heads;

Fig. 2 is a side view of the head, partly in section;

Fig. 3 is a side elevation, partly in section, of w the head at the opposite end of the cylinder;

Fig. 4 is an end elevation, looking in the direction of the arrow 4 in Fig. 3'; 4

Fig. 5 is a front elevation, partly in section, of the blank from which the geared portion of the cylinder gear is formed;

Fig. 6 is an end view of the blank, looking in the direction of the arrow 6 in Fig. 5;

Fig. 7 is a front elevation, partly in section, of the part from which the cylindrical portion of the cylinder gear is formed;

Fig. 8 is an end view, looking in the direction of the arrow 8 in Fig. 7;

Fig. 9 is an end View of a severed portion of the cylinder shown in Figs. '7 and 8;

5 Fig. 10 is a partial end view of the gear blank after the teeth are formed therein;

Fig. 11 is a transverse section of the complete cylinder gear, and

Fig. 12 is a longitudinal section of the complete 50 gear, taken along the line |2|2 in Fig. 11.

Referring to Figs. 11 and 12, my improved cylinder gear comprises a left-hand head 20, a righthand head 2|, a longitudinally elongated segmental gear portion 22 and an elongated cylindri- 55 cal portion 23. 1 7

The heads and 2| are separately formed 4 and finished, as indicated in Figs. 1 to 4. The head 2!) is a plain annular member or ring, preferably finished all over and having abeveled outer edge as indicated at 24. The head (2| .is likewise preferably finished all over and is similar to the head 20 except that it is provided with an elongated hub portion 25. ,Thehead 2| alsohas a slightly beveled portion 25 for a purpose to be described.

The gear portion 22 of the cylinder gear is preferably formed from the blank shown in Figs. 5 and 6, which may be in the form of a cast cylinder 30, preferably having its ends and inner surfaces finished and having recessed portions 3| at the ends to receive the heads 20 and 2|; Slightly beveled portions 32 are also provided at the ends.

After the cylinder gear blank has been prepared as indicated in Figs. 5 and 6, the blank is mounted in a gear cutting machine of any desired type and teeth 33 (Fig. 10) are cut around the entire periphery. The gear blank is then severed at opposite ends of a diameter by a saw or milling cutter which cuts the blank along the dotted lines a and b (Fig. 10) and which removes the shaded portions between the lines a and b at each side of the gear, so that after the blank is severed each portion of the blank contains one less than one-half of the number of teeth in the U complete blank. 7

The cylindrical part of the gear is preferably formed from a piece of pipe 40 as shown in Fig. '7, which pipe is provided with recesses 4| corresponding to the recesses 3| in the gear blank 30. The pipe is also preferably interiorly beveled at the ends as indicated at 42.

The pipe 40 is then severed along lines at opposite ends of a diameter, as indicated by dotted lines o and d in Fig. 8, thus providing two partial 4O cylindrical portions, (as 23 in Fig. 9) with the ends beveled similarly to the associated ends of the gear portion 22.

Having prepared these several parts, I assemble the gear portion 22 and the heads 20 and 2| in a suitable form or clamp and braze or weld these parts together along their inner surfaces, as indicated at 45 in Fig. 12. o

I then apply the cylindrical portion 23 to the heads 2|] and 2|, as indicated in Fig. 11, and secure these assembled parts firmly and accurately in position in a form or clamp. I then proceed to weld the parts securely together as indicated at 46, 41 and 4B. The Welding material 46 flows into the spaces provided by beveling the ends of the various parts as previously described, and the spaces between the edges of the segmental gear portion 22 and the cylindrical portion 23.

By proceeding as above described, I provide a cylinder gear for a Knowles head which may be easily and economically produced and which is entirely accurate, reliable and satisfactory in use. It will be understood that each gear blank provides gear portions for two cylinder gears and that each cylindrical portion or pipe 40 provides cylindrical parts 23 for two cylinder gears. Where the word welding occurs in the claims, it is to be understood as including also brazing.

Having thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but what I claim is:-

1. The method of making a complete segmental cylinder gear which comprises forming an elongated and substantially semi-cylindrical gear part, forming an elongated and substantially semi-cylindrical tube part, providing two separate heads for said segmental cylinder gear, welding the two heads one at each end of one of said semi-cylindrical parts at the inside of said heads, applying the other semi-cylindrical part to said assembled parts to form a complete cylindrical element, and welding said gear part and said tube part to said heads at the outside of said. heads and welding said gear part to said tube part at their axially extended abutting edges, thereby forming a complete segmental cylinder gear.

2. The method of making two complete segmental cylinder gears which comprises making a complete elongated toothed gear, severing said gear into two substantially semi-cylindrical gear parts, providing a complete elongated tube, severing said tube into two substantially semi-cylindrical tube parts, providing two right-hand and two lefthand heads for said cylinder gears, permanently assembling and welding one substantially semicylindrical gear part, one substantially semicylindrical tube part, and a pair of right and lefthand heads to form a complete segmental cylinder gear, and permanently assembling and welding the other substantially semi-cylindrical gear part, the other substantially semi-cylindrical tube part, and the second pair of right and left-hand heads to form a second complete segmental cylinder gear, the gear part and the tube part in each complete segmental cylinder gear forming a hollow and substantially cylindrical element and having a right-hand and a left-hand head secured thereto and at the opposite ends thereof.

-WILLIAM M. WATTIE. 

